cc: Fix header include guards of our header files.

cc/scrollbar_geometry_fixed_thumb.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CCScrollbarGeometryFixedThumb_h
-#define CCScrollbarGeometryFixedThumb_h
+#ifndef CC_SCROLLBAR_GEOMETRY_FIXED_THUMB_H_
+#define CC_SCROLLBAR_GEOMETRY_FIXED_THUMB_H_
 
 #include "IntSize.h"
 #include "cc/cc_export.h"
 #include "cc/scrollbar_geometry_stub.h"
 
 namespace cc {
 
 // This scrollbar geometry class behaves exactly like a normal geometry except
 // it always returns a fixed thumb length. This allows a page to zoom (changing
 // the total size of the scrollable area, changing the thumb length) while not
@@ skipping 13 matching lines @@
     virtual void splitTrack(WebKit::WebScrollbar*, const WebKit::WebRect& track, WebKit::WebRect& startTrack, WebKit::WebRect& thumb, WebKit::WebRect& endTrack) OVERRIDE;
 
 private:
     explicit ScrollbarGeometryFixedThumb(scoped_ptr<WebKit::WebScrollbarThemeGeometry>);
 
     IntSize m_thumbSize;
 };
 
 }
 
-#endif
+#endif  // CC_SCROLLBAR_GEOMETRY_FIXED_THUMB_H_